<template>
  <div class="login-container">
    <el-form ref="form" :model="form" :rules="rules" class="login-form" autocomplete="on" label-position="left">

      <div class="title-container">
        <h3 class="title">{{ title }}</h3>
      </div>

      <el-form-item prop="username">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input
          ref="username"
          v-model="form.username"
          placeholder="请输入用户名"
          name="username"
          type="text"
          tabindex="1"
          autocomplete="on"
        />
      </el-form-item>

      <el-tooltip v-model="capsTooltip" content="Caps lock is On" placement="right" manual>
        <el-form-item prop="password">
          <span class="svg-container">
            <svg-icon icon-class="password" />
          </span>
          <el-input
            :key="passwordType"
            ref="password"
            v-model="form.password"
            :type="passwordType"
            placeholder="请输入密码"
            name="password"
            tabindex="1"
            autocomplete="on"
            @keyup.native="checkCapslock"
            @blur="capsTooltip = false"
            @keyup.enter.native="login"
          />
          <span class="show-pwd" @click="showPwd">
            <svg-icon :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'" />
          </span>
        </el-form-item>
      </el-tooltip>
      <el-form-item prop="captcha">
        <span class="svg-container">
          <svg-icon icon-class="bug" />
        </span>
        <el-input
          v-model="form.captcha"
          placeholder="请输入验证码"
          name="captcha"
          type="text"
          tabindex="1"
        />
        <span class="captcha" @click="chgUrl" v-html="captcha" />
      </el-form-item>
      <el-button :loading="loading" type="primary" style="width:100%;margin-bottom:30px;" @click.native.prevent="login">Login</el-button>
    </el-form>
  </div>
</template>

<script>
import { validUsername } from '@/utils/validate'
import Request from '@/utils/request'
import defaultSetting from '@/settings'
export default {
  name: 'Login',
  data() {
    const validateUsername = (rule, value, callback) => {
      if (!validUsername(value)) {
        callback(new Error('用户名格式错误'))
      } else {
        callback()
      }
    }
    const validatePassword = (rule, value, callback) => {
      if (value.length < 6) {
        callback(new Error('密码格式错误'))
      } else {
        callback()
      }
    }
    const validateCaptcha = (rule, value, callback) => {
      if (value.length !== 4) {
        callback(new Error('请输入4位验证码'))
      } else {
        callback()
      }
    }
    return {
      captcha: '',
      form: {
        username: '',
        password: '',
        captcha: ''
      },
      rules: {
        username: [{ required: true, trigger: 'blur', validator: validateUsername }],
        password: [{ required: true, trigger: 'blur', validator: validatePassword }],
        captcha: [{ required: true, trigger: 'blur', validator: validateCaptcha }]
      },
      passwordType: 'password',
      capsTooltip: false,
      loading: false,
      otherQuery: {},
      title: defaultSetting.title
    }
  },
  created() {
    this.$store.dispatch('user/clearUser')
    this.chgUrl()
  },
  mounted() {
    if (this.form.username === '') {
      this.$refs.username.focus()
    } else if (this.form.password === '') {
      this.$refs.password.focus()
    }
  },
  methods: {
    chgUrl() {
      Request.get('/user/captcha').then(res => {
        this.captcha = res
      })
    },
    checkCapslock(e) {
      const { key } = e
      this.capsTooltip = key && key.length === 1 && (key >= 'A' && key <= 'Z')
    },
    showPwd() {
      if (this.passwordType === 'password') {
        this.passwordType = ''
      } else {
        this.passwordType = 'password'
      }
      this.$nextTick(() => {
        this.$refs.password.focus()
      })
    },
    login() {
      this.$refs.form.validate(valid => {
        if (valid) {
          this.loading = true
          this.$store.dispatch('user/login', this.form)
            .then(() => {
              this.$router.push('/')
              this.loading = false
            })
            .catch(() => {
              this.loading = false
            })
        } else {
          console.log('error submit!!')
          return false
        }
      })
    }
  }
}
</script>

<style lang="scss">
  .captcha{
    cursor: pointer;
    position: absolute;
    right: 0;
  }
$bg:#283443;
$light_gray:#fff;
$cursor: #fff;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
  .login-container .el-input input {
    color: #000;
  }
}

/* reset element-ui css */
.login-container {
  .el-input {
    display: inline-block;
    height: 47px;
    width: 85%;

    input {
      background: transparent;
      border: 0;
      -webkit-appearance: none;
      border-radius: 0;
      padding: 12px 5px 12px 15px;
      color: #000;
      height: 47px;
      caret-color: #000;

      &:-webkit-autofill {
        box-shadow: 0 0 0 1000px $bg inset !important;
        -webkit-text-fill-color: $cursor !important;
      }
    }
  }

  .el-form-item {
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    color: #454545;
  }
}
</style>

<style lang="scss" scoped>
$bg:#fff;
$dark_gray:#000;
$light_gray:#eee;

.login-container {
  min-height: 100%;
  width: 100%;
  background-color: $bg;
  overflow: hidden;

  .login-form {
    position: relative;
    width: 520px;
    max-width: 100%;
    padding: 160px 35px 0;
    margin: 0 auto;
    overflow: hidden;
  }

  .tips {
    font-size: 14px;
    color: $bg;
    margin-bottom: 10px;

    span {
      &:first-of-type {
        margin-right: 16px;
      }
    }
  }

  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
    position: relative;

    .title {
      font-size: 26px;
      color: #000;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }
}
</style>
